text: /* The industrial I/O core function defs.
   *
   * Copyright (c) 2008 Jonathan Cameron
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   *
   * These definitions are meant for use only within the IIO core, not individual
   * drivers.
   */
  
  #ifndef _IIO_CORE_H_
  #define _IIO_CORE_H_
  #include <linux/kernel.h>
  #include <linux/device.h>
  
  struct iio_chan_spec;
  struct iio_dev;
  
  extern struct device_type iio_device_type;
  
  int __iio_add_chan_devattr(const char *postfix,
  			   struct iio_chan_spec const *chan,
  			   ssize_t (*func)(struct device *dev,
  					   struct device_attribute *attr,
  					   char *buf),
  			   ssize_t (*writefunc)(struct device *dev,
  						struct device_attribute *attr,
  						const char *buf,
  						size_t len),
  			   u64 mask,
  			   enum iio_shared_by shared_by,
  			   struct device *dev,
  			   struct list_head *attr_list);
  void iio_free_chan_devattr_list(struct list_head *attr_list);
  
  ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
  
  /* Event interface flags */
  #define IIO_BUSY_BIT_POS 1
  
  #ifdef CONFIG_IIO_BUFFER
  struct poll_table_struct;
  
  unsigned int iio_buffer_poll(struct file *filp,
  			     struct poll_table_struct *wait);
  ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
  				      size_t n, loff_t *f_ps);
  
  int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
  void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
  
  #define iio_buffer_poll_addr (&iio_buffer_poll)
  #define iio_buffer_read_first_n_outer_addr (&iio_buffer_read_first_n_outer)
  
  void iio_disable_all_buffers(struct iio_dev *indio_dev);
  void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
  
  #else
  
  #define iio_buffer_poll_addr NULL
  #define iio_buffer_read_first_n_outer_addr NULL
  
  static inline int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
  {
  	return 0;
  }
  
  static inline void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
  
  static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
  static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
  
  #endif
  
  int iio_device_register_eventset(struct iio_dev *indio_dev);
  void iio_device_unregister_eventset(struct iio_dev *indio_dev);
  void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
  int iio_event_getfd(struct iio_dev *indio_dev);
  
  #endif
  